For a 10-day project, activity B's duration is three days, and activity C's duration is two days. What is the duration of activity A if activities B and C are performed in parallel?

The correct answer is C. 7 days. When activities are performed in parallel (simultaneously), their combined elapsed duration equals only the longest of the two, not their sum. Activities B (3 days) and C (2 days) running in parallel take 3 days total (the longer of the two). Since the total project duration is 1

Predictive, Plan-Based Methodologies

Question

For a 10-day project, activity B's duration is three days, and activity C's duration is two days. What is the duration of activity A if activities B and C are performed in parallel?

Options

A3 days
B5 days
C7 days
D10 days

How the community answered

(31 responses)

A
3% (1)
B
3% (1)
C
84% (26)
D
10% (3)

Explanation

When activities are performed in parallel (simultaneously), their combined elapsed duration equals only the longest of the two, not their sum. Activities B (3 days) and C (2 days) running in parallel take 3 days total (the longer of the two). Since the total project duration is 10 days, Activity A must account for the remaining time: 10 − 3 = 7 days. If B and C were sequential, they would take 5 days combined, leaving only 5 days for A. The parallel execution is the key constraint that drives the answer to 7 days.

Topics

#Activity Duration#Parallel Activities#Schedule Calculation#Project Duration

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